Electrical receptacle



R. B. BENJAMIN.

ELECTRICAL RECEPTACLE.

APPLICATION FILED OCT. 9. 1911.

1,404,731 Patented Jan. 31, 1922.

- M0va-w MM (3 WW UNITED STATES PATENT OFFICE.

REUBEN B. BENJAMIN, OF CHICAGO, ILLINOIS, ASSIGNOB '1'0 BENJ ELECTRICMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI-nnnornrcan nncnrraom.

Patented Jan. 31, 1922.

Application filed October 9, 1917. Serial No. 185,534.

To all whom it may concern: 7

Be it known that I, REUBEN B. BENJAMIN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Electrical Receptacles, of whichthe following is a full, clear, concise, and exact description,reference being had to the accompanying drawing, forming a part of thisspecificatlon.

My invention relates to electrical receptacles.

One of the objects of my invention is to provide an electricalreceptacle which shall be simple in construction, easy and cheap tomanufacture, easy to wire, and durable and eficient in use. Furtherobjects will appear from the detailed description to follow and from thea pended claims.

In the d i'awings, in which two embodiments of my invention are shown-Fig. 1 is an axial section on the line 11 of Fig. 2, showing anelectrical receptacle embodying my invention;

Fig. 2 is a transverse section on the line 2-2 of Fig. 1;

Fig. 3 is a bottom-plan view of Fig. 1;

Fig. 4 is a section on the line 4-4 of' Fig. 2;

ig. 5 is a section on the line 5--5 of Fig. 2; and

Fig. 6 is an axial section of an electrical receptacle showing anotherform of my invention.

Referring now to the drawings in detail, and first to the form shown inFigs. 1 to 5, inclusive; the receptacle shown comprises an insulatingbase 10 recessed in its outer faceto receive the threaded shell contacts11 and the center contact 12, and recessed on its inner face to receivethe binding-terminals 13 and 14, respectively, a sheet-metal cap 15having a screw-threaded portion 16 threaded over thecorrespondingly-threaded inner end of the base 10, and a metal bushing17 internally screw-threaded at 18 to be screwed onto anexternally-threaded nipple. A suitable insulating washer 19 may beplaced inside the cap 15 between the nipple 16 and the base 10 toprevent the feed-wires from coming in contact with the bushing 17. Thecap 15 is freely rotatable with respect to the bushing 17, and is heldin place thereon by means of a washer-like member 20, which the bushing17, the lower edge of the bushmg 17 being headed over the edge of themember 20, as indicated at 21. The insulatmg base 10 is held fromrotation with respect to the bushing 17 by means of lugs 22 formedIntegral with the washer member 20 and extending into recesses 23 in theupper face of the insulatin base 10, the washer 19 being provided withapertures through which the lugs 22 extend.

The contacts 11 and 12 may be connected wlth the binding-terminals 13and 14, respectively, by means of screws 24 and 25, respectlvely. Theinsulating base 10 may be provided with an annular groove 26 to providemeans for attaching a shade or a shadeholder. The shell contact 11 maybe secured to the base 10 by means of a pair of eyelets 27 extendingthrough registering openings in the flange of the shell 11 and in theinsulating base 10 (Fig. 5).

In wiring the receptacle, the base 10 is unscrewed from the cap 15, thebushing 17 is screwed onto the end of the externally screw-threadednipple, and the ends of the lead-wires are secured to thebinding-terminals 13 and 14. The cap 15 .is then screwed down onto theinsulating base 10, the swivel connection between the cap 15 and thebushing 17 permittin the connection to be made without twistlng thefeedwires.

The non-rotatable connection between the bushing 17 and the insulatingbase 10, accomplished by means of the lugs 22 extending into therecesses 23, prevents the rotation of the insulating base 10 when alamp-base is being screwed into or out of the receptacle.

In the form of my invention shown in Fig, 6, the parts may be the sameas in the form just described with this exception: that a bushing 28 ofinsulating material is substituted for. the metallic bushing 17 In thisform of my invention, which is used with a pendant socket, the bushing28 co-operates with an abutment 29 on the base 10 to grip the conductors30 and take the strain off the binding terminals 13 and 14. In this formof my invention it is not necessary to provide means for preventingrelative rotation between the bushing 28 and the insulating base 10, asthe base 10 will be grasped in one hand when the lamp is being screwedinto place in the receptacle.

55 may be of. sheet-metal, firm y secured to In wiring the device, thecap 15 is unno screwed from the base 10, the conductors are connected tothe binding-terminals 13 and 14, respective] and the cap 15 is thenscrewed down on t e. base 10.

I claim as new and desire to secure by Letters Patent:

1. An electrical receptacle comprising an insulating base having arecess therein, shell and center contacts supported in said recess,binding-terminals supported by said base, a tubular bushing providing aassage for conductors to said binding-terminals, and a cap having aswivel connection with said bushing and a detachable connection withsaid base and supporting said base from said 2 An electrical receptaclecomprising an insulating base having a recess therein, shell and centercontacts supported in said recess, binding-terminals supported by saidbase, a tubular bushing provl ing a passa for conductors to saidbinding-termina s, and a ca having a swivel connection with saidbushing, the upper end of said base bei externally screw-threaded, andsaid cap aving a rtion threaded over said externallythrea ed portion.

3. An electrical receptacle comprising an insulatin base having a recesstherein shell an center wntacts supported in said recess,binding-terminals supported by said base, a tubular bushin providing apassage for conductors to sai binding-termlnals, a cap having a swivelconnection with said bushing and a detachable connection with said baseand sup orting said base from said cap, and means or preventing relativerotation between said bushing and base.

4. An electrical receptacle comprising an insulating base having arecess therein, shell and center contacts supported in said recess,bindin -terminals supported by said base, a tubu ar b'ushin roviding apassage for conductors to said binding-terminals, a cap having a swivelconnection with said bushing and a detachable connection with said base,said base having a recess therein, and a member non-rotatably secured tosaid bushing and extending into said recess to prevent relative rotationbetween said base and bushing.

In witness whereof, I have hereunto subscribed my name.

REUBEN B. BENJAMIN.

